title: Effect of leucine-to-methionine substitutions on the diffraction quality of histone chaperone SET/TAF-Ibeta/INHAT crystals.
abstract: One of the most frequent problems in crystallization is poor quality of the crystals. In order to overcome this obstacle several methods have been utilized, including amino-acid substitutions of the target protein. Here, an example is presented of crystal-quality improvement by leucine-to-methionine substitutions. A variant protein with three amino-acid substitutions enabled improvement of the crystal quality of the histone chaperone SET/TAF-Ibeta/INHAT when combined with optimization of the cryoconditions. This procedure improved the resolution of the SET/TAF-Ibeta/INHAT crystals from around 5.5 to 2.3 A without changing the crystallization conditions.
authors.affiliation: Structure Guided Drug Development Project, Research and Development Department, Japan Biological Informatics Consortium, 2-42 Aomi, Koto-ku, Tokyo 135-0064, Japan.
authors.forename: Miki
authors.initials: M
authors.lastname: Senda
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Muto
authors.forename: Masami
authors.initials: M
authors.lastname: Horikoshi
authors.forename: Toshiya
authors.initials: T
authors.lastname: Senda
mesh_terms: D019943:Amino Acid Substitution; D002868:Chromosomal Proteins, Non-Histone / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D003460:Crystallization; D018360:Crystallography, X-Ray; D004268:DNA-Binding Proteins; D014644:Genetic Variation; D056488:Histone Chaperones; D006657:Histones / Q000378:metabolism; D006801:Humans; D007930:Leucine / Q000378:metabolism*; D008715:Methionine / Q000378:metabolism*; D018832:Molecular Chaperones / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D012680:Sensitivity and Specificity; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism
chemical_list: D002868:Chromosomal Proteins, Non-Histone; D004268:DNA-Binding Proteins; D056488:Histone Chaperones; D006657:Histones; D018832:Molecular Chaperones; C513473:SET protein, human; D014157:Transcription Factors; D008715:Methionine; D007930:Leucine